Sifa za Thamani za Kichaguzi Kutoka kwa Safu kwenye React

Wacha tuchukue kwamba vitu vya orodha bado vimehifadhiwa kwenye safu:

jsxfunction App() {
  const texts = ['text1', 'text2', 'text3', 'text4'];
  const [value, setValue] = useState('');
  
  ...
}

Wacha tuunde kwa kutumia safu hii vitambulisho option, tukiwapa kama sifa value thamani za vitu vya safu:

jsxfunction App() {
  const texts = ['text1', 'text2', 'text3', 'text4'];
  const [value, setValue] = useState('');
  
  const options = texts.map((text, index) => {
    return <option key={index} value={index}>{text}</option>;
  });
  
  ...
}

Kwa kutumia vitambulisho vilivyoundwa tuunde orodha ya kushuka:

jsxreturn <div>
  <select value={value} onChange={event => setValue(event.target.value)}>
    {options}
  </select>
</div>;

Tuonyeshe kwenye aya nambari ya kitu kilichochaguliwa:

jsxreturn <div>
  <select value={value} onChange={event => setValue(event.target.value)}>
    {options}
  </select>
  <p>
    chaguo lako: {value}
  </p>
</div>;

Sasa tuonyeshe maandishi ya kitu kilichochaguliwa, tukitumia nambari yake na safu yenye maandishi:

jsxreturn <div>
  <select value={value} onChange={event => setValue(event.target.value)}>
    {options}
  </select>
  <p>
    chaguo lako: {texts[value]}
  </p>
</div>;

Wacha tukusanye yote pamoja na tupate msimbo ufuatao:

jsxfunction App() {
  const texts = ['text1', 'text2', 'text3', 'text4'];
  const [value, setValue] = useState('');
  
  const options = texts.map((text, index) => {
    return <option key={index} value={index}>{text}</option>;
  });
  
  return <div>
    <select value={value} onChange={event => setValue(event.target.value)}>
      {options}
    </select>
    <p>
      chaguo lako: {texts[value]}
    </p>
  </div>;
}